What Kind of Skin Is PN Rebuilder T (Trouble Line) Used For?

Summary: PN Rebuilder T is the line of polynucleotide (PN) skin boosters designed for breakout-prone skin. It is used to help weakened skin recover after inflammation has calmed down, and it is often planned together with inflammation treatments such as Gold PTT.

Written by: Lee Ji-seung, Medical Director (Korean Medicine Doctor, PhD in Eastern and Western Medicine) · Date: 2026.10.16

Hello, I am Lee Ji-seung, Medical Director of Medical Bloom Korean Medicine Clinic · COEX. I am often asked, "Can I get a skin booster if I have acne-prone skin?" We use PN Rebuilder T for breakout-prone skin, and when it is used matters as much as what is used. Today I will explain what kind of skin PN Rebuilder T is used for and when it is added during breakout treatment.

What Is PN (Polynucleotide)?

PN is an ingredient made by purifying the fragments that make up DNA. Most PN used in aesthetics is obtained from fish such as salmon and trout, which is why it is also nicknamed "salmon injections."

PN is known to support an environment in which damaged tissue can recover (results vary from person to person). Its purpose differs from that of hyaluronic acid skin boosters, which fill the skin with moisture. Rather than adding moisture, it is closer to building a foundation from which tired skin can recover on its own.

When T Is Chosen Among R, T and H

PN Rebuilder is divided into three lines, R, T and H, according to purpose. I consider T for the following types of skin.

• Skin that breaks out often and has become sensitive — Skin that turns red easily even with minor irritation after repeated breakouts.
• Skin that has become thin with lingering redness after inflammation has calmed down — New acne has decreased, but the skin has not yet recovered.
• When planned together with breakout treatments such as Gold PTT or POTENZA — Inflammation treatment and recovery treatment are planned as one flow.

The differences between the three lines are covered in detail in a separate post comparing PN Rebuilder R, T and H.

When PN Is Used for Breakout-Prone Skin

• When inflammation is at its peak — A period with many red, painful pimples. Inflammation is treated first, and PN is considered area by area.
• When inflammation is calming down — A period when new acne decreases but redness remains. This is the main period for PN Rebuilder T.
• Recovery period — A period when marks and skin texture are the concern. It may be planned together with other treatments such as POTENZA.

For breakout-prone skin, the order of treatments that control inflammation and treatments that help the skin recover is important. If recovery treatment is rushed while inflammation is still severe, it is hard to notice the change you expect. I decide when to add PN by looking at how much acne remains and how much redness and marking there is.

Treatment Process and Recovery

• Consultation and skin check — We first look at the stage of acne, skin thickness and how sensitive the skin is.
• Day of treatment — Small bumps or redness may appear where the injections were given.
• Days 1–3 — The bumps usually settle, and some people may bruise (results vary from person to person).

For a few days after treatment, avoid rubbing the injected areas hard, and avoid saunas or strenuous exercise. Detailed aftercare instructions are given separately on the day of treatment.

Frequently Asked Questions

Q. Can I get it while I have active acne?

Areas with severe inflammation are avoided, and treatment often starts with areas where inflammation has calmed down. We decide based on the condition of each area.

Q. How many sessions do I need?

It depends on your skin condition, and it is usually done several times at intervals. The number of sessions and the intervals are decided together during consultation after looking at your skin.

Q. Can I get it if I have a fish allergy?

PN is an ingredient obtained from fish. If you have a fish or seafood allergy, please be sure to tell us during consultation. We will decide together whether the treatment is suitable.

After treatment, temporary redness, swelling, small bumps or bruising may occur. Results and side effects may vary from person to person. Please consult thoroughly with the medical staff before treatment.

At Medical Bloom Korean Medicine Clinic · COEX, we decide when to use PN Rebuilder T by looking at the stage of acne and how well the skin has recovered. If your skin has become sensitive after breakouts, please feel free to contact us. Medical Bloom Korean Medicine Clinic · COEX is a 4-minute walk from Exits 9·10 of Seolleung Station.

References

• Cavallini M, et al. Consensus report on the use of PN-HPT (polynucleotides highly purified technology) in aesthetic medicine. J Cosmet Dermatol. 2021;20(3):922-928.
• PN Rebuilder manufacturer's public materials